1. Turn the ignition key to the "ON" position.
2. Press and hold the "SEEK" button on the radio for at least 5 seconds.
3. Enter the 4-digit security code using the radio's preset buttons.
To enter the first digit, press the preset buttons 1-6 until the desired number appears on the display.
Repeat this step for the remaining digits.
4. Press and hold the "SEEK" button again for at least 5 seconds to confirm the code.
5. The radio will now be unlocked and you can use it normally.